The Hybrid Racing Big Tube Intake Kit is the culmination of extensive design, testing, and refinement, specifically tailored for the 8th Gen Civic Si platform. Whether your setup is stock or modified with high-lift cams and large exhausts, this intake is engineered to deliver significant power gains. Dyno tests showcase a peak gain of 14hp and an average gain of 9hp over the stock air box, and improvements of 2-3hp with a smoother power band compared to competing 3.5" cold air intakes.

Advanced Full Silicone Construction

A standout feature of this intake is its full silicone construction. The 1/4" thick, fiberglass-reinforced silicone tubing not only withstands engine vacuum but also insulates the intake charge more effectively than metal or plastic alternatives. This results in cooler intake air temperatures, a denser air charge, and increased overall power.

Velocity Stack for Enhanced Airflow

Included in the kit is a 6" velocity stack, designed to reduce inlet restrictions and boost air intake, further amplifying power output.

Innovative Anti-Hydrolock Bypass Manifold

The kit features an injection molded air bypass manifold that serves multiple purposes. It accommodates the factory MAF, silicone tubing for the valve cover vent and air bypass valve, and incorporates a built-in air bypass feature. This unique system prevents hydro-lock in heavy rain, as demonstrated in tests with a submerged air filter.

Helmholtz Resonance Reduction for Smooth Power Delivery

The internal geometry of the air bypass manifold is specially designed to smooth out the power band by reducing parasitic Helmholtz resonance. The result is an intake that consistently outperforms the stock air box and other 3.5" intakes.

Comprehensive Kit with Battery Relocation

Each kit includes a powder-coated steel battery tray for relocating the battery, creating space for the intake's substantial piping. A silicone upper radiator hose is provided for better clearance, along with silicone tubing to replace the OEM rubber valve cover breather and air bypass tube. This adds a clean, finished look to the engine bay. All necessary bolts, hose clamps, and hardware for installation are included.

Tuning Software Required

Installation of this kit requires tuning software like Hondata's Flash Pro. The kit is optimized for MAP tunes and is not suitable for use with the factory ECU calibration.

Note: Sold as a Complete Kit

This intake system is available exclusively as a complete kit and is not offered in individual pieces.